Normal reactions include mild swelling, redness, tenderness and small bruises at the injection points, which usually settle within a few days to two weeks.<\/p>\n\n\n\n
Early Warning Signs to Watch For<\/h2>\n\n\n\n\n- Swelling that increases after 48 to 72 hours rather than decreasing.<\/li>\n\n\n\n
- Redness, warmth and pain that worsen, sometimes with fever.<\/li>\n\n\n\n
- Firm, painful lumps.<\/li>\n\n\n\n
- A visible bluish tint under thin skin (Tyndall effect), often in the tear trough.<\/li>\n\n\n\n
- Asymmetry that persists after swelling has resolved.<\/li>\n<\/ul>\n\n\n\n
Serious or Urgent Signs Requiring Immediate Attention<\/h2>\n\n\n\n![\"\"](\"https:\/\/kinamihealth.com\/wp-content\/uploads\/2025\/09\/image-97-1024x682.png\")
<\/figure>\n\n\n\n\n- Blanching or whitening of the skin<\/strong> during or shortly after the injection.<\/li>\n\n\n\n
- A mottled, purplish or dark pattern<\/strong> spreading on the skin.<\/li>\n\n\n\n
- Severe pain<\/strong> out of proportion to the procedure.<\/li>\n\n\n\n
- Changes in vision<\/strong>, eye pain or drooping eyelid.<\/li>\n\n\n\n
- Difficulty breathing, swelling of the face or throat<\/strong>, which may indicate a severe allergic reaction: call 911.<\/li>\n<\/ul>\n\n\n\n
Vision changes or signs of vascular occlusion require immediate medical care. Vascular occlusion caused by an HA filler is treated urgently with hyaluronidase by the injector.<\/p>\n\n\n\n
Causes of Dermal Filler Complications<\/h2>\n\n\n\n\n- Injection into or near a blood vessel.<\/li>\n\n\n\n
- Insufficient asepsis or contaminated products.<\/li>\n\n\n\n
- An inappropriate product, depth or volume for the area.<\/li>\n\n\n\n
- Patient factors, such as an immune reaction, a recent infection or an undeclared condition.<\/li>\n\n\n\n
- Products of unknown origin, particularly those sold to the public online. See our article on DIY fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
Reducing the Risk of Complications<\/h2>\n\n\n\n![\"\"](\"https:\/\/kinamihealth.com\/wp-content\/uploads\/2025\/09\/image-96-1024x682.png\")
<\/figure>\n\n\n\n\n- Choose a qualified injector. In Canada, who may inject fillers depends on the province and the professional college.<\/li>\n\n\n\n
- Make sure the clinic uses products from legitimate supply channels, such as the JUV\u00c9DERM\u00ae<\/a>, RESTYLANE\u00ae<\/a>, BELOTERO\u00ae<\/a>, TEOSYAL\u00ae<\/a> or REVANESSE\u00ae<\/a> ranges, with recorded lot numbers.<\/li>\n\n\n\n
- Share your complete medical history.<\/li>\n\n\n\n
- Follow aftercare instructions. See what not to do after fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
For clinics, having hyaluronidase available, a written complication protocol and trained staff is essential.<\/p>\n\n\n\n
When and How to Seek Professional Help<\/h2>\n\n\n\n
Contact your injector as soon as you notice an unusual sign, even outside office hours. If you cannot reach them and the signs are serious, go to the emergency department and mention that you received a filler, specifying the product if possible. In Canada, patients and healthcare professionals can report any suspected adverse reaction to Health Canada through the Canada Vigilance Program. Clinics can find all products in our dermal fillers<\/a> category.<\/p>\n\n\n\nReferences <\/h3>\n\n\n\n
American Academy of Ophthalmology. (n.d.). Complications of hyaluronic acid fillers<\/em>. Retrieved from https:\/\/eyewiki.org\/Complications_of_Hyaluronic_Acid_Fillers<\/a><\/p>\n\n\n\nSclafani, A. P. (2008). Safety, efficacy, and utility of hyaluronic acid fillers in the periocular region. Seminars in Plastic Surgery, 22<\/em>(2), 120\u2013125. https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0738081X08002514<\/a><\/p>\n\n\n\n
Serious or Urgent Signs Requiring Immediate Attention<\/h2>\n\n\n\n<\/figure>\n\n\n\n\n- Blanching or whitening of the skin<\/strong> during or shortly after the injection.<\/li>\n\n\n\n
- A mottled, purplish or dark pattern<\/strong> spreading on the skin.<\/li>\n\n\n\n
- Severe pain<\/strong> out of proportion to the procedure.<\/li>\n\n\n\n
- Changes in vision<\/strong>, eye pain or drooping eyelid.<\/li>\n\n\n\n
- Difficulty breathing, swelling of the face or throat<\/strong>, which may indicate a severe allergic reaction: call 911.<\/li>\n<\/ul>\n\n\n\n
Vision changes or signs of vascular occlusion require immediate medical care. Vascular occlusion caused by an HA filler is treated urgently with hyaluronidase by the injector.<\/p>\n\n\n\n
Causes of Dermal Filler Complications<\/h2>\n\n\n\n\n- Injection into or near a blood vessel.<\/li>\n\n\n\n
- Insufficient asepsis or contaminated products.<\/li>\n\n\n\n
- An inappropriate product, depth or volume for the area.<\/li>\n\n\n\n
- Patient factors, such as an immune reaction, a recent infection or an undeclared condition.<\/li>\n\n\n\n
- Products of unknown origin, particularly those sold to the public online. See our article on DIY fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
Reducing the Risk of Complications<\/h2>\n\n\n\n<\/figure>\n\n\n\n\n- Choose a qualified injector. In Canada, who may inject fillers depends on the province and the professional college.<\/li>\n\n\n\n
- Make sure the clinic uses products from legitimate supply channels, such as the JUV\u00c9DERM\u00ae<\/a>, RESTYLANE\u00ae<\/a>, BELOTERO\u00ae<\/a>, TEOSYAL\u00ae<\/a> or REVANESSE\u00ae<\/a> ranges, with recorded lot numbers.<\/li>\n\n\n\n
- Share your complete medical history.<\/li>\n\n\n\n
- Follow aftercare instructions. See what not to do after fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
For clinics, having hyaluronidase available, a written complication protocol and trained staff is essential.<\/p>\n\n\n\n
When and How to Seek Professional Help<\/h2>\n\n\n\n
Contact your injector as soon as you notice an unusual sign, even outside office hours. If you cannot reach them and the signs are serious, go to the emergency department and mention that you received a filler, specifying the product if possible. In Canada, patients and healthcare professionals can report any suspected adverse reaction to Health Canada through the Canada Vigilance Program. Clinics can find all products in our dermal fillers<\/a> category.<\/p>\n\n\n\nReferences <\/h3>\n\n\n\n
American Academy of Ophthalmology. (n.d.). Complications of hyaluronic acid fillers<\/em>. Retrieved from https:\/\/eyewiki.org\/Complications_of_Hyaluronic_Acid_Fillers<\/a><\/p>\n\n\n\nSclafani, A. P. (2008). Safety, efficacy, and utility of hyaluronic acid fillers in the periocular region. Seminars in Plastic Surgery, 22<\/em>(2), 120\u2013125. https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0738081X08002514<\/a><\/p>\n\n\n\n
<\/figure>\n\n\n\n- \n
- Blanching or whitening of the skin<\/strong> during or shortly after the injection.<\/li>\n\n\n\n
- A mottled, purplish or dark pattern<\/strong> spreading on the skin.<\/li>\n\n\n\n
- Severe pain<\/strong> out of proportion to the procedure.<\/li>\n\n\n\n
- Changes in vision<\/strong>, eye pain or drooping eyelid.<\/li>\n\n\n\n
- Difficulty breathing, swelling of the face or throat<\/strong>, which may indicate a severe allergic reaction: call 911.<\/li>\n<\/ul>\n\n\n\n
Vision changes or signs of vascular occlusion require immediate medical care. Vascular occlusion caused by an HA filler is treated urgently with hyaluronidase by the injector.<\/p>\n\n\n\n
Causes of Dermal Filler Complications<\/h2>\n\n\n\n
- \n
- Injection into or near a blood vessel.<\/li>\n\n\n\n
- Insufficient asepsis or contaminated products.<\/li>\n\n\n\n
- An inappropriate product, depth or volume for the area.<\/li>\n\n\n\n
- Patient factors, such as an immune reaction, a recent infection or an undeclared condition.<\/li>\n\n\n\n
- Products of unknown origin, particularly those sold to the public online. See our article on DIY fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
Reducing the Risk of Complications<\/h2>\n\n\n\n
<\/figure>\n\n\n\n- \n
- Choose a qualified injector. In Canada, who may inject fillers depends on the province and the professional college.<\/li>\n\n\n\n
- Make sure the clinic uses products from legitimate supply channels, such as the JUV\u00c9DERM\u00ae<\/a>, RESTYLANE\u00ae<\/a>, BELOTERO\u00ae<\/a>, TEOSYAL\u00ae<\/a> or REVANESSE\u00ae<\/a> ranges, with recorded lot numbers.<\/li>\n\n\n\n
- Share your complete medical history.<\/li>\n\n\n\n
- Follow aftercare instructions. See what not to do after fillers<\/a>.<\/li>\n<\/ul>\n\n\n\n
For clinics, having hyaluronidase available, a written complication protocol and trained staff is essential.<\/p>\n\n\n\n
When and How to Seek Professional Help<\/h2>\n\n\n\n
Contact your injector as soon as you notice an unusual sign, even outside office hours. If you cannot reach them and the signs are serious, go to the emergency department and mention that you received a filler, specifying the product if possible. In Canada, patients and healthcare professionals can report any suspected adverse reaction to Health Canada through the Canada Vigilance Program. Clinics can find all products in our dermal fillers<\/a> category.<\/p>\n\n\n\n
References <\/h3>\n\n\n\n
American Academy of Ophthalmology. (n.d.). Complications of hyaluronic acid fillers<\/em>. Retrieved from https:\/\/eyewiki.org\/Complications_of_Hyaluronic_Acid_Fillers<\/a><\/p>\n\n\n\n
Sclafani, A. P. (2008). Safety, efficacy, and utility of hyaluronic acid fillers in the periocular region. Seminars in Plastic Surgery, 22<\/em>(2), 120\u2013125. https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0738081X08002514<\/a><\/p>\n\n\n\n
- A mottled, purplish or dark pattern<\/strong> spreading on the skin.<\/li>\n\n\n\n